采动条件下顶板逆断层失稳-活化机制分析  

Analysis of Roof Reverse Fault Instability-reactivation Mechanism Under Mining

作　　者：张卫强[1] 孙强[1] 朱术云[1] 刘德乾[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《煤矿安全》2013年第3期179-182,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41102201;41002113);中国博士后基金资助项目(2011M500971)

摘　　要：通过分析岩石受力破坏过程的膨胀扩容效应,研究了采动效应下断层系统的变形稳定性问题。随着开挖不断接近断层带,断层带附近应力不断集中,相当于对断层带及周围介质组成的系统所进行的一个不断加载过程,当到达临界条件时,系统发生失稳。断层活化的物理本质就是在加载过程中,随着应变(由应力集中所引起)的不断积累到一定程度,岩石进入体积膨胀阶段,导致系统物理力学性质的变化。Through analyzing the expanding effect of rock during destruction process, deformation and instability problem of fault system under mining is studied. As the excavation constantly close to the fault zone, the stress around fault zone is concentrated, which is a loading process for the system composted by fault zone and surrounding medium. When it reaches the critical condition, system failure occurs. The fault reactivation essence is the change of physical and mechanical properties for the system during the loading, which is resulted by the excavation, when the stress is accumulated （caused by the stress concentration） to a critical content.

关 键 词：岩石力学 断层 失稳 断层活化 膨胀扩容效应 采动效应 

分 类 号：TD327.2[矿业工程—矿井建设]